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I’ve worked in labs and the like for far too many years and I have never seen the ‘carcinogen’ sign. What is the point of putting up a sign which nobody knows the meaning of? Myself I would put up a simple yellow triangle with an exclamation mark and the phrase ‘Warning Carcinogens Present’. There should also be a mandatory/prohibition signs telling people what special precautions the need to follow above and beyond the normal lab ones like don’t eat and drink and wash your hands before you leave.

Carcinogens are definitely not a biological hazard (That’s reserved for microorganisms)

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